ABSTRACT

The purpose of this study was to investigate the effects of positive behavior support(PBS) intervention using PictureExchange Communication System(PECS) on problem behaviors of the elementary school student with autismspectrum disorder. For the study, a child with autism spectrum disorder was selected and individualized PBS withfunctional assessment were implemented using multiple treatment design. PECS intervention was conducted withsetting events and antecedent events, alternative behaviors, consequences. The baseline and intervention wereobserved in a special class room during study and break time. Remaining effects were observed two weeks afterlast intervention. Social validity were measured by 50 people, who work as a special education teacher or specialeducation students at university. The results of this study is as follows. First, the effect of PBS intervention usingPECS makes strong decrease of acquisition function behavior and little decrease of evasion function behavior.Second, the effect of PBS intervention using PECS was maintained even after intervention ended. Third, socialvalidity of this research was over average level, makes chance to apply this intervention on public education. Thesignificance of this study is as follows. First, PBS intervention using PECS can be applied reducing problembehavior of an non-verbal elementary school student with severe autism used as a kind of communications. Second,PBS intervention using PECS made significant differences between effective and less effective intervention applied atan elementary school student with autism spectrum disorder who have problem at sensory stimulus.

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